Add helper function on library module

lib/namarara.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'namarara/version'
 
 module Namarara; end
@@ -9,3 +11,19 @@ require 'namarara/parser'
 require 'namarara/eval_error'
 require 'namarara/errors/var_not_defined'
 require 'namarara/errors/invalid_grammar'
+
+module Namarara
+  def self.parse_string(line, vars, debug = false)
+    parser = Parser.new(Lexer.new)
+    parser.names = vars
+    parser_bet = parser.parse(line.chomp, debug)
+    parser.check_grammar line, parser_bet
+
+    {
+      expr: line,
+      tree: parser_bet.to_s,
+      errors: parser_bet&.errors&.map { |e| e.message },
+      result: parser_bet&.compute
+    }
+  end
+end

lib/namarara/errors/invalid_grammar.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Namarara
   module Errors
     class InvalidGrammar < EvalError

lib/namarara/errors/var_not_defined.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Namarara
   module Errors
     class VarNotDefined < EvalError

lib/namarara/eval_error.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Namarara
   class EvalError
     attr_accessor :var

lib/namarara/lexer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Namarara
   class Lexer < Rly::Lex
     attr_reader :logger
@@ -27,11 +29,9 @@ module Namarara
     end
 
     on_error do |t|
-      unless t.lexer.logger.nil?
-        t.lexer.logger.error "Illegal character #{t.value}"
-      end
+      t.lexer.logger&.error "Illegal character #{t.value}"
       t.lexer.pos += 1
       nil
     end
-  end # class
-end # module
+  end
+end

lib/namarara/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Namarara
-  VERSION = '0.9.4'.freeze
+  VERSION = '0.9.4'
 end

namarara.gemspec

@@ -32,6 +32,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'thor'
   spec.add_development_dependency 'rly'
+  spec.add_development_dependency 'sinatra'
   spec.add_development_dependency "bundler", "~> 1.15"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"